The gravitational potential energy gained by a body of mass m raised through a height h near the Earth's surface is
Correct answer: A. mgh
- A. mgh
- B. half mgh
- C. mg divided by h
- D. mh
Explanation
The work done against a constant weight mg over a height h is mgh, and only the vertical height matters, not the path taken. Carrying a load up a ramp therefore requires the same work against gravity as lifting it straight up, though the force needed is smaller over a longer distance. Potential energy is always measured relative to a chosen zero level.
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About Potential Energy
Potential energy is energy stored because of position or configuration, including gravitational potential energy near Earth's surface and elastic energy in a stretched or compressed spring. Questions use changes in potential energy and conservation of mechanical energy, while distinguishing a chosen reference level from an absolute zero of energy.
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